repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * RAW Chinese AVS video demuxer | |
| 3 | * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Lesser General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2.1 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * FFmpeg is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Lesser General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Lesser General Public | |
| 18 | * License along with FFmpeg; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 20 | */ | |
| 21 | ||
| 22 | #include "avformat.h" | |
| 23 | #include "rawdec.h" | |
| 24 | ||
| 25 | #define CAVS_SEQ_START_CODE 0x000001b0 | |
| 26 | #define CAVS_PIC_I_START_CODE 0x000001b3 | |
| 27 | #define CAVS_UNDEF_START_CODE 0x000001b4 | |
| 28 | #define CAVS_PIC_PB_START_CODE 0x000001b6 | |
| 29 | #define CAVS_VIDEO_EDIT_CODE 0x000001b7 | |
| 30 | #define CAVS_PROFILE_JIZHUN 0x20 | |
| 31 | ||
| 32 | static int cavsvideo_probe(AVProbeData *p) | |
| 33 | { | |
| 34 | uint32_t code= -1; | |
| 35 | int pic=0, seq=0, slice_pos = 0; | |
| 36 | int i; | |
| 37 | ||
| 38 | for(i=0; i<p->buf_size; i++){ | |
| 39 | code = (code<<8) + p->buf[i]; | |
| 40 | if ((code & 0xffffff00) == 0x100) { | |
| 41 | if(code < CAVS_SEQ_START_CODE) { | |
| 42 | /* slices have to be consecutive */ | |
| 43 | if(code < slice_pos) | |
| 44 | return 0; | |
| 45 | slice_pos = code; | |
| 46 | } else { | |
| 47 | slice_pos = 0; | |
| 48 | } | |
| 49 | if (code == CAVS_SEQ_START_CODE) { | |
| 50 | seq++; | |
| 51 | /* check for the only currently supported profile */ | |
| 52 | if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) | |
| 53 | return 0; | |
| 54 | } else if ((code == CAVS_PIC_I_START_CODE) || | |
| 55 | (code == CAVS_PIC_PB_START_CODE)) { | |
| 56 | pic++; | |
| 57 | } else if ((code == CAVS_UNDEF_START_CODE) || | |
| 58 | (code > CAVS_VIDEO_EDIT_CODE)) { | |
| 59 | return 0; | |
| 60 | } | |
| 61 | } | |
| 62 | } | |
| 63 | if(seq && seq*9<=pic*10) | |
| 64 | return AVPROBE_SCORE_EXTENSION+1; | |
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS) |